Ramona Stammermann Dept. of Civil, Architectural & Environmental Engineering, Drexel University, Philadelphia, PA Michael Piasecki Dept. of Civil Engineering, City College New York, New York City, NY High Resolution Numerical Models of Tidal Marshes in the Delaware Bay Delaware Estuary Science & Environmental Summit 2013, Cape May , NJ
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High Resolution Numerical Models of Tidal Marshes in … · Delaware Estuary Delaware Estuary Science & Environmental Summit 2013, Cape May , NJ
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Num. Modeling of transport processes in tidal marshes
• influence of marsh geometry on hydrodynamics and transport processes
• influence of sediment availability in Delaware Estuary on sediment distribution patterns on tidal flats and in tidal channels of adjacent marsh systems
• influence of storm events on erosion and deposition patterns
Summary • Tracer experiments useful to determine general transport paths • High grid resolution in combination with many processes
(hydrodynamic, sediment transport, heat transport, salt transport) results in low model efficiency important to find balance between spatial accuracy and efficiency
• Importance of accurate topographic data – Height of tidal flats determines when flooding starts
• Erosion/deposition patterns show – importance of good initial bathymetry data
here: bathymetry based on interpolation between cross sectional measurements
>> in first days of model run bathymetry reacts strongly to hydrodynamic conditions and adjusts
– Importance of vegetation without vegetation high velocities - resulting in larger unrealistic
National Estuarine Research Reserve Graduate Research Fellowship
Graduate Research Assistantship
This research was supported, in part, under National Science Foundation Grants CNS-0958379 and CNS-0855217 and the City University of New York High Performance Computing Center.
• suspended sediment concentration dependent on sediment composition on the ground >> the finer the d50 the higher the concentration need to adjust initial d50 to reach desired sediment concentration in water column
for sensitivity studies Problem: - the finer the d50 the more erosion >> unrealistic - limiting the erodable layer cuts off supply at some point >> no long term results yet that show significant deposition on tidal flats
• settling velocity calculated based on d50 >> consistently too high >> material settles completely during slack tide